Extrusion & Post
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Process connection problems when switching production between different processing methods of random copolymer polypropylene pipe special material random copolymer polypropylene pipe special material (Variant: strengthened measures)
Problem Phenomenon
When switching from one processing method to another (such as injection to extrusion), the product quality fluctuates greatly, and a long debugging time is required.
Poor process connection affects production efficiency and product quality.
In particular, extra attention is needed on the original basis, this problem is more prominent and needs key attention.
Cause Analysis
（1）Different processing methods have different material requirements (MFR, molecular weight, etc.)
（2）The parameter settings do not match after equipment conversion
（3）The operators are not familiar with the other processing method
（4）Raw material batch differences are superimposed on the changeover adjustment
（5）The preparation before the changeover is insufficient
（6）On the original basis, extra attention is needed: process parameter fluctuations or equipment status changes have aggravated this problem
Solution
（1）Establish a changeover operating procedure, clarifying the process parameter range for each processing method
（2）Prepare suitable material grades before the changeover
（3）The operators are trained in multiple processing methods
（4）During the changeover, do a small batch trial production first, and mass produce after passing the inspection
（5）Establish material processing adaptability archives
（6）And strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
Key Takeaway
The changeover connection needs to be planned in advance and fully prepared, and the key is to clarify the differentiated requirements of different processing methods for materials.
In different production scenarios, targeted preventive measures need to be taken.
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